Power distribution network reliability assessment method considering power supply quality

Abstract

The invention discloses a power distribution network reliability assessment method considering power supply quality. The method includes: for the urban medium-voltage power distribution network, adding the voltage qualification rate to serve as a new reliability measurement index; calculating correlation coefficients of the small index, the voltage qualification rate and the average power supply reliability rate respectively based on a Pearson correlation coefficient method and a Spearman correlation coefficient method; and comparing the correlation coefficients of the two correlation analysismethods to obtain different influence degrees of each index on the power supply reliability, and screening out key indexes influencing the power supply reliability of the power distribution network;analyzing and calculating the correlation degree between the key index and the power supply reliability by adopting a grey correlation degree analysis method, and determining the weight of each key index; and calculating objective weights of the selected evaluation indexes by adopting an entropy weight method, carrying out comprehensive optimization on two weight results to obtain a final weight,finishing optimization correction on the weights of the selected reliability key indexes, and establishing a power supply reliability evaluation index system of the distribution network to realize multi-dimensional reliability evaluation of the distribution network.

Description

technical field [0001] The invention belongs to the field of distribution network reliability evaluation, and in particular relates to a distribution network reliability evaluation method considering power supply quality. Background technique [0002] With the development of the economy, the stable supply of electric power has become an issue of increasing concern. The power distribution system is at the end of the power system and is an important link between the entire power system and users. Studying the reliability of power distribution system is an important measure to ensure the quality of power supply in the power system, and it is the basis for the construction and improvement of urban power grids. In recent years, power has gradually developed into large power grids, large capacity, UHV, EHV, AC / DC, smart grids, and multi-energy systems. The complexity of power systems has gradually increased, and the safety and reliability of power grids have become increasingly p...

AI Technical Summary

Problems solved by technology

The calculation of domestic distribution network reliability indicators is mainly based on historical statistical data, which is probabilistic and statistical, and lacks scientific data statistical methods and indicator evaluation systems

In addition, because the distribution network is directly connected to the user end, the power quality problem has a more serious impact on the reliability of the distribution network. However, the previous research on the reliability evaluation of distribution network power supply often uses the power supply reliability rate and user power outage time as the power supply reliability measurement index. , does not consider the impact of power supply quality problems on power supply reliability

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